Grate



P. SMITH.

Grate.

No. 23,621. Patented April 12, 1859.l

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PHILIP SMITH, OF FALL RIVER, MASSACHUSETTS.

GRATE.

Specification of Letters Patent No. 23,621, dated April 12, 1859.

To all whom 'it may concern:

Be it known that I, PI-iimi SMITH, of Fall River, in the county oi Bristol and State of h/Iassachusetts, have invented certain new and useful Improvements in Grates tor Burning Coal, ttc.; and I do hereby declare that the same are described and represented in the following specifications and drawings.

To enable others skilled in the art to make and use my improvements I will proceed to describe their construction and operation referring to the drawings in which the same letters indicate like parts in each of the figures. f

Figure l, is a front elevation of a grate with my improvements. Fig. 2, is a plan o-r top view. Fig. 3, is a section on the line e, e.

The nature of my invention consists in hanging the lower part of the front of the grate on pivots so far below the top that when the bottom is swung out to form an opening for the removal of unburned coal, cinders, clinkers or stones it will carry the top of the plate in and press the upper plate so hard against the burning coal that it will hold it up while the cinders and stones are being removed from under it. And in arranging the upper inner front plate to vibrate, so as to be pressed against the burning coal by the vibration of the lower plate, and hold up said coal while the incombustible matter below it is removed. Also in making the front frame and front plate in separate pieces so that they may shrink and swell with freedom without straining any of the part-s which compose them.

In the accompanying drawings A, is the back of the grate box B, B, the ends and C, the front all of which are firmly fastened together making a strong rectangular grate boX, the form ot which box may be varied if desirable.

I), D, are bottom grate bars with openings E, E, between them. This bo-ttom grate is arranged high enough to leave the open space F, below it for the ash pit.

The front C, is made in the form shown in Fig. l, with an opening in it partially closed by the frame H, which is similar in form to the front C, but narrower, and arranged to slide in perpendicularly, just behind the front C. The top bar ot' H is wider than the top bar of C, andV comes below it, and it is perforated as shown at I, I, F ig. l.

The opening in the frame H, is stopped by the plate Gr, so as to hold the coal, which plate is provided with pivots J, shown in dotted lines some distance from the top, which pivots are arranged to turn in recesses, in the frame H, when the plate G, is vibrated. This plate G, has the bars K, K, projecting down from its lower edge nearly or quite to the top of the bottom grate D. The plate Gr, is held in a perpendicular position by the plate or rack L, which extends nearly to the top ot' the front and is hung on pivots M, M, which turn in recesses in the frame H.

The inside of the plate L, is shown in Fig. et, and the outside in Fig. 5. It consists of three perpendicular bars N, N, connected by t-he bottom bar P, and top bar Q, the ends of the latter forming pivots to hold it in place, and allow it to vibrate. The inside of the bars N, N, are made wider than the outside, and arranged for the bars R, R, to slip in between them; these bars R, R, being made narrowest on the outside and widest on the inside or just the reverse of the bars N, N, as shown in Figs. 6, and 7, the latter of which is an edge view of one of the bars It, which bars have a piece across the top which prevents them from slipping down, as does also the wide part which rests on the bottom bar P. IVhen these bars are put into the frame a plate is formed level on both sides and the pivots are set ott as shown in Fig. 3, so that the weight of the plate swings against the top of the plate Gr, and holds in perpendicular. The plates G, and L, being so constructed and arranged that when the bottom of G, is swung out, its top acts on L, and pushes its lower edge in against the coal in the grate to 'hold it up while the operator pulls out the slag cinder or slate which has accumulated on the grate D, in pieces too large to pass between the bars. The plate H, is itted into t-he plate H, shown by dotted lines in Fig. l, similar in form to the plate I-I, which plate H', is made to slide into the grooves b, S, shown in Fig. 2.

The tire is kindled in this grate in the usual manner and after it has burned a while and that portion of the coal which does not burn to ashes has accumulated on the grate bars with cinders, clinkers and stones, too large to pass through between the bars of the bottom` grate but choke and obstruct the free burning of the lire, the attendant pulls out the bottom of the plate G, with the poker, into the position shown by dotted lines in Fig. 3, which presses the plate L, into the position shown by dotted lines in the same figure, so as to hold up the Lipper part of the burning coals in the grate while the attendant pulls the coal which will not burn with the cinders, clinkers and stones off of the grate D, and they fall into the ash pit out of the way, when he pushes in the bottom of the plate G, and the plate L, releases the burning coals which it held up and they fall onto the grate D, making room for a charge of fresh coal abo-ve them. In this way the .fire may be continued a long time or until some part of the grate burns out.

By making the front of the grate in separate pieces as described andthe plate L, the several parts may expand and contract with freedom without warping or breaking the other portions.

I believe I have described and represented my improvements in grates for burning 3. I claim the plates H, and H', constructi ed and arranged substantially as described. I also claim making the plate L, in separate pieces fitted together substantially in the manner described.

PHILIP SMITH. IVitnesses:

J. C. BLINswELL, MICHAEL LINSEY. 

